The other day I inserted the disk to my HP 3840 and installed the printer. I also registered the product and printed a test page. But today, when I went to print a document from Word, the computer said "Printer: no printer selected" in the dropbox. So I clicked on "add printer" and it brought me to a window with my printer, HP 3840 was listed. When I clicked on the printer to make it the default printer, and selected "add," I received an error message stating: "An error occurred while trying to add the selected printer. Error:-9672." Also, I am just using it through the USB port on my Macbook, nothing fancy. How can I set up this printer? I have also looked up this problem elsewhere online and it said to uninstall the printer and add it through the Printer Utilities option in Utilities, but I do not even have that. Please help, I have a thesis due on Monday. Thanks in advance.